Effects of Tunable Data Compression on Geophysical Products Retrieved from Surface Radar Observations with Applications to Spaceborne Meteorological Radars

Philip M. Gabriel, Penshu Yeh, Si-Chee Tsay
2014 Journal of Atmospheric and Oceanic Technology  
This paper presents results and analyses of applying an international space data 3 compression standard to weather radar measurements that can easily span 8 orders of 4 magnitude and typically require a large storage capacity as well as significant bandwidth 5 for transmission. By varying the degree of the data compression, we analyzed the non-6 linear response of models that relate measured radar reflectivity and/or Doppler spectra to 7 the moments and properties of the particle size
more » ... icle size distribution characterizing clouds and pre-8 cipitation. Preliminary results for the meteorologically important phenomena of clouds 9 and light rain indicate that for a ±0.5 dB calibration uncertainty, typical for the ground-10 based pulsed-Doppler 94 GHz (or 3.2 mm, W-band) weather radar used as a proxy for 11 spaceborne radar in this study, a lossless compression ratio of only 1.2 is achievable. 12 However, further analyses of the non-linear response of various models of rainfall rate, 13 liquid water content and median volume diameter show that a lossy data compression ra-14 tio exceeding 15 is realizable. The exploratory analyses presented are relevant to future 15 satellite missions, where the transmission bandwidth is premium and storage require-16 ments of vast volumes of data, potentially problematic. 17 18 Figure 7. Global error distribution of (a) radar reflectivity, (b) rainfall rate, (c) liquid wa-595 ter content and (d) median volume diameter, computed for CR=15. 596 597
doi:10.1175/jtech-d-13-00257.1 fatcat:sdpr2wit2ncttb7qevg5x4n4bm